很奇怪的指代－请指教!

来自大全187

1.        By analyzing the advanced olfactory apparatus of Pleistocene chordates, paleozoologists have discovered a link between the brain’s regions of scent discrimination and its regions of long-term memory storage, a link that could prove invaluable in the treatment of amnesia victims.a

(A) paleozoologists have discovered a link between the
                brain’s regions of scent discrimination and its regions
            of long-term memory storage

(B) a link between the brain’s regions of scent discrimination and its regions of long-term memory storage has been discovered by paleozoologists

(C) there is a link that paleozoologists have discovered between the brain’s regions of scent discrimination and its regions of long-term memory storage

(D) the discovery of a link between the brain’s regions of scent discrimination and its regions of long-term memory storage was made by paleozoologists（A）

(E) the brain’s regions of scent discrimination and long-term memory storage have a link that was discovered by paleozoologists

选A没问题，可是这个A中的its 指代brain's 可以哦？？？

According to OG 10 SC 90, this does seem problematic, although the scenarios are not quite the same in both cases.

But, hey, no other answer works! In a real exam, we'll have to choose A.

这种指代是可以的

sb's 用 its/their指代是可以的